Which one of the statements is correct with reference to the circulation of blood in a mammal?

  • A
    Left auricle receives oxygenated blood from the lungs
  • B
    Pulmonary artery returns oxygenated blood from the lungs to the left auricle
  • C
    Pulmonary vein carries venous blood from right auricle to lungs
  • D
    Venous blood is returned to the left auricle

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Reason : Due to this fact,it can initiate excitatory waves at the highest rate.

What is the significance of the time gap in the passage of the action potential from the sino-atrial node to the ventricle?

When the heart of a frog is removed from the body,it continues to beat for some time. Select the correct statement$(s)$ from the following:
$(i)$ The frog is a cold-blooded animal.
$(ii)$ The frog does not have a heart-based circulatory system.
$(iii)$ The heart has myogenic properties.
$(iv)$ The heart is self-excitable.

In humans,blood flows from the posterior vena cava into the diastolic right atrium due to:

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